Dimension information: 
Motor diameter: 27.7mm 
Body length: 37.8mm 
Shaft diameter: 2.3mm 

Technical Performance: 
RS-385SAP-2170-57C 
Voltage range: 9-25V 
Working voltage: 20V 
No load: 
Speed: 17500r/min 
Current: 0.2A 
On load: 
Speed: 14750 r/min 
Current: 1.08A 
Rated load: 99g. Cm 
At Stall: 
Torque: 630g. Cm 
Current: 5.8A 

RS-385SA-12183D 
Working voltage: 24V 
No load: 
Speed: 8000 r/min 
Current: 0.06A 
On load: 
Speed: 6742 r/min 
Current: 0.27A 
Rated load: 43.9g. Cm 
At Stall: 
Torque: 240g. Cm 
Current: 1.2A 

RS-385SA-1890D 
Working voltage: 12V 
No load: 
Speed: 8250 r/min 
Current: 0.13A 
On load: 
Speed: 6820 r/min 
Current: 0.62A 
Rated load: 46.5g. Cm 
At Stall: 
Torque: 270g. Cm 
Current: 3.0A